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Xiaoming took part in a math activity.
Let s= 1/2+ 1/2? + 1/2? +........... 1/2 n

Then 2s=2×( 1/2+ 1/2? + 1/2? +...............n) 1+ 1/2+ 1/2? + 1/2? + 1/2 (N- 1)

2s-s = 1+ 1/2+ 1/2？ + 1/2? (n- 1)-( 1/2+ 1/2？ + 1/2? +.............. 1/2 n)

So s =1-1/2 n.

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